Analysis of efficiency of space-time signal processing methods in mobile communication systems
DOI:
https://doi.org/10.30837/pt.2018.2.01Keywords:
Signal, Model, Antenna, Access, Signal-interfering environmentAbstract
The possibility of using recursive procedures in the space-time access problems as more constructive ones that perform correction of the weight vector of an antenna array in real time scale is considered, which is especially important for communication with mobile users. In order to evaluate the weight vector of the antenna array it has been proposed to use the optimal signal processing method in the space of Kalman-Bucy state variables, which allowed to achieve a stable mode of such processing on the action interval of the mobile stations’ call signals without changing the operating modes of the mobile communication network. A method is proposed that takes into account the a priori data about the direction of arrival of signals at the initial stage of the installation of the weight coefficient vector, which provides reduction of the convergence interval for the adaptation process of control algorithms and the required efficiency of the space-time processing of the adaptive antenna array. The influence of initial conditions on the installation of the weight vector on the characteristics of the quality of space-time processing of a linear 4-element adaptive antenna array under the influence of one and two obstacles for the LMSD and MOSN algorithms according to the signal/(interference+noise) is analyzed. It is shown that due to the successful initial selection of the value of the complex weight vector for a linear 4-element adaptive antenna array it has been possible to significantly improve the transient characteristics of the algorithms.References
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